21201112000 has 224 divisors, whose sum is σ = 55855575360. Its totient is φ = 7948800000.

The previous prime is 21201111991. The next prime is 21201112003. The reversal of 21201112000 is 21110212.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201112003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15351310 + ... + 15352690.

Almost surely, 2^21201112000 is an apocalyptic number.

21201112000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21201112000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27927787680).

21201112000 is an abundant number, since it is smaller than the sum of its proper divisors (34654463360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21201112000 is a wasteful number, since it uses less digits than its factorization.

21201112000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528 (or 1508 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21201112000 its reverse (21110212), we get a palindrome (21222222212).

The spelling of 21201112000 in words is "twenty-one billion, two hundred one million, one hundred twelve thousand".